Hypothesis 1.Nostradamus got visions of the future. And described it in his own words. He used coded descriptions.

Comparison 1.Nostradamus is like a reporter reporting on main events that happen in the future. He writes about them in his own words.

Channeling - Hypothesis 2.Nostradamus heard a summary describing some of the main events that happened during the centuries. He described it in his own words. He used coded descriptions.

Hypothesis 3.Nostradamus listened to a specially prepared coded summary describing some of the main events that happend during the centuries ahead of his time. He described it with his own words and added his own concealments.